public class Example3_1{
  public static void main (String args[]){
     char a1 = '十',a2 = '点',a3 = '进',a4 ='攻';
     char secret = 'A';
     a1 = (char)(a1^secret);
     a2 = (char)(a2^secret);
     a3 = (char)(a3^secret);
     a4 = (char)(a4^secret);
     System.out.println("密文:"+a1+a2+a3+a4);
     a1 = (char)(a1^secret);
     a2 = (char)(a2^secret);
     a3 = (char)(a3^secret); 
     a4 = (char)(a4^secret);
     System.out.println("原文:"+a1+a2+a3+a4);
  }
}



